My coloring/shading isn't great, I'm not really good at that sort of thing, but I've tried to add it to some more pieces, cause people generally like color more that B/W. It's definitely missing from the hair, and probably other places, such as the armpit. I also sill have trouble with proportions and the like, it might be alright as it, but I'm sure there's places to improve. Perspective might be off, I feel like the shoulder on the left doesn't line up perfectly, among other things. The linework is evidently not clean if someone looks at it.
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https://imgur.com/EUkIomS